Patents by Inventor Keisuke Hakuya

Keisuke Hakuya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polyoxyalkylene polyamide-glycidyl ether adduct epoxy resin curing agent
    Patent number: 8178598
    Abstract: A curing agent for epoxy resin, and a coating composition using the curing agent curing agent that delivers excellent recoatability and overcoatability after a long time exposure. (A) An epoxy curing agent that is derived by adduction between amide-type reactants from polyamine compounds comprising from 25-75 mol % of a polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof and glycidyl ether compound; (B) An epoxy curing agent of the mixture of (B1) amide-type reactants prepared through polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof, and (B2) a reactant is derived by adduction between other aliphatic polyamines or a mixture thereof and glycidyl ether compound. Coating composition comprising the epoxy curing agent of the above described A or B.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: May 15, 2012
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Keisuke Hakuya, Michael Ian Cook, Kouichi Sakasegawa, Yoshimi Hasegawa
  • Curing agent for epoxy resin and coating composition
    Publication number: 20080045659
    Abstract: A curing agent for epoxy resin, and a coating composition using the curing agent curing agent that delivers excellent recoatability and overcoatability after a long time exposure. (A) An epoxy curing agent that is derived by adduction between amide-type reactants from polyamine compounds comprising from 25-75 mol % of a polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof and glycidyl ether compound; (B) An epoxy curing agent of the mixture of (B1) amide-type reactants prepared through polyoxyalkylene-polyamine and carboxylic acids or a mixture thereof, and (B2) a reactant is derived by adduction between other aliphatic polyamines or a mixture thereof and glycidyl ether compound. Coating composition comprising the epoxy curing agent of the above described A or B.
    Type: Application
    Filed: June 12, 2007
    Publication date: February 21, 2008
    Applicant: Air Products and Chemicals, Inc.
    Inventors: Keisuke Hakuya, Michael Ian Cook, Kouichi Sakasegawa, Yoshimi Hasegawa